/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Yu
 */
public class CheckServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	String user = request.getParameter("user");
	String paswd = request.getParameter("paswd");
	HashMap database = new HashMap();
	database.put("Yu", "007341");
	database.put("Wang", "5656");
	database.put("papa", "0430");
	String tmppaswd = (String) database.get(user);
	String mes = " ";
	if (tmppaswd == null) {
	    mes = "帳號不存在";
	    request.setAttribute("mes", mes);
	    RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
	    rd.forward(request, response);
	    return;

	} else if (!tmppaswd.equals(paswd)) {
	    mes = "密碼錯誤";
	    request.setAttribute("mes", mes);
	    RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
	    rd.forward(request, response);
	} else {
	    mes = "帳號密碼正確";
	    response.sendRedirect("welcome.jsp");
	    
	}

	response.setContentType("text/html;charset=UTF-8");
	PrintWriter out = response.getWriter();
	try {
	    /* TODO output your page here. You may use following sample code. */
	    out.println("<!DOCTYPE html>");
	    out.println("<html>");
	    out.println("<head>");
	    out.println("<title>Servlet CheckServlet</title>");
	    out.println("</head>");
	    out.println("<body>");
	    out.println("<h1>Servlet CheckServlet at " + request.getContextPath() + "</h1>");
	    out.println(mes +"<br>");
	    out.println("帳號:" + user + "<br>");
	    out.println("密碼:" + paswd);
	    out.println("</body>");
	    out.println("</html>");
	} finally {
	    out.close();
	}
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
	return "Short description";
    }// </editor-fold>

}
